US3223869A - Commutator for an electric motor - Google Patents

Commutator for an electric motor Download PDF

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Publication number
US3223869A
US3223869A US172502A US17250262A US3223869A US 3223869 A US3223869 A US 3223869A US 172502 A US172502 A US 172502A US 17250262 A US17250262 A US 17250262A US 3223869 A US3223869 A US 3223869A
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US
United States
Prior art keywords
commutator
segment
tongue
bracket
intermediate portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US172502A
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English (en)
Inventor
Reisnecker Ludwig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3223869A publication Critical patent/US3223869A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/06—Manufacture of commutators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/32—Connections of conductor to commutator segment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine
    • Y10T29/49011—Commutator or slip ring assembly

Definitions

  • the present invention relates to commutators and in particular to a process and apparatus for providing commutators with a structure which facilitates connection of armature leads to the segments of the commutator.
  • an object of the present invention to provide a process according to which a commutator may be provided with a structure which very greatly facilitates the joining of the armature leads to the commutator segments.
  • the invention includes, in a process for manufacturing a commutator, the steps of raising from that end of each commutator segment to which armature leads are to-be connected a tongue which extends longitudinally of the commutator segment at its outer face, placing beneath said tongue on the surface exposed by this tongue the intermediate portion of substantially U-shaped bracket, and pressing the tongue downwardly against this intermediate portion of the bracket so as to fix the latter to the commutator segment, the bracket having a pair of legs extending from its intermediate portion and directed away from the commutator axis so that armature leads may conveniently. be located between these legs of the bracket to be reliably fixed to the commutator segment.
  • FIG. 1 is a fragmentary transverse sectional view of a commutator of the present invention, FIG. 1 illustrating different stages in the process of manufacture of the commutator and being taken along line 1-1 of FIG. 2 in the direction of the arrows;
  • FIG. 2 is a fragmentary longitudinal sectional view of a commutator according. to the invention showing the latter just before the armature leads are joined thereto, the section of FIG. 2 being taken along line 11-11 of FIG. 1 in the direction of the arrows;
  • FIG. 3 is a fragmentary perspective illustration of an end of a commutator segment which is acted upon accordingto the process of the present invention, FIG. 3 showing this end of the. commutator segment just before a bracket is joined thereto;
  • FIG. 4 is a perspective illustration of a bracket which is adapted to be joined to the commutator segment shown in FIG. 3, and the bracket shown in FIG. 4 is also shown in. the assemblies of FIGS. 1 and 2;
  • FIG. 5 is a perspective illustration of another embodiment of a bracket adapted to be used with the structure of the invention.
  • FIG. 6 is a perspective illustration of a still further embodiment of a bracket according to the present invention.
  • the commutator illustrated fragmentarily therein includes a hub portion 10 of cylindrical configuration made of an electrically non-conductive material as is well known in the art, and the individual commutator segments 11 are embedded in the body of non conducti-ve material 10, these segments 11 of course being electrically conductive, having exposed faces which are adapted to be engaged by the brushes, and each segment 11 has a pair of anchoring claws 12, one of which is shown in FIG. 2, also embedded in the body 10 so as to provide a very secure connection of the several commutator segments 11. to the plastic body 10 of the commutator.
  • a section 13, shown in dot-dash lines in FIG. 3, is raised with a suitable cutting tool from each segment 11 to form the tongue 14 shown in FIG. 3. and this tongue 14 is located at the outer surface of each segment and extends longitudinally thereof.
  • the tongue 14 will expose a surface of each segment 11 beneath this tongue 14, and the intermediate portion 18 of a substantially U-shaped. bracket having legs 20 is placed on this exposed surface beneath. the tongue 14.
  • the width of the intermediate portion 18 of the bracket which is of course electrically conductive, is substantially less than the length of the tongue 14,
  • FIG. 1 is shown in the condition it takes just before the intermediate portion 18 of the bracket is placed beneath the tongue 14 thereof, while the second segment from the left in FIG. 1 shows the bracket fixed to the segment with the fixing tongue 15 already formed by being pressed downwardly against the intermediate portion of the bracket.
  • the pair of parallel legs of the bracket extend away from the axis of the commutator.
  • the assembly of the brackets in the proper positions with respect to the segments is greatly facilitated by the grooves 16 and 17 which enable the brackets to be properly aligned with the segments 11.
  • These brackets may also have the construction shown in FIGS. 5 and 6. Thus, in FIG.
  • the pair of parallel legs 20 have a pair of portions 21 respectively extending downwardly beyond the intermediate portion 18 so as to become located in the grooves 16 and 17 and in this way these grooves participate in the positioning of the brackets, while in FIG. 6 the legs 20 also have downwardly directed portions 23 which are formed simply by bending the bracket in the manner shown in FIG. 6, and these portions 23 also extend into the grooves shown in FIG. 3, these grooves 16 and 17 respectively receiving the portions 23 shown in FIG. 6. While the bracket of FIG. 6 is very simply bent from a single strip into the configuration shown in FIG. 6, the bracket of FIG.
  • bracket 5 is formed by slitting the portions of the bracket on the opposite sides of the intermediate part 18 thereof so as to produce the downwardly directed portions 21 when the legs 20 are bent so as to extend perpendicularly from the intermediate portion 18.
  • brackets serve to connect the leads of the unillustrated armature to the several commutator segments.
  • the ends 22 of the armature leads are placed between the legs 20 of each bracket, as shown with the second segment 11 from the right in FIG. 1, andthereafter the free ends of these legs are pressed downwardly against the leads 22 in the manner shown at the right in FIG. 1 so as to fix the leads to the bracket and of course to the commutator segment.
  • the leads are joined to the bracket and commutator segment, and of course this joining may be carried out by soldering and in particular by dip-soldering with the use of a known structure for this purpose, and this arrangement is particularly suitable with the structure of the invention.
  • soldering may also be provided at the joining of the intermediate portion 18 of each bracket to the segment 11 by the hook-shaped element 15, such soldering taking place during manufacture of the commutator.
  • the body is formed with ribs 24 located at the exterior of the commutator between the several segments 11 thereof, as indicated in FIG. 1, and these ribs prevent the soldering material from bridging across between a pair of adjoining commutator segments 11.
  • the commutator having the structure of the invention and formed according to the process of the invention is capable of resisting all stresses which are encountered in use of the structure and in particular will resist stresses arising from high speeds of rotation. Moreover, there is provided a very favorable flow of current from the commutator segments to the armature winding, These properties are particularly suitable for commutators of electric motors which have high current loads, such as, for example, starting motors for internal combustion engines, where the armature windings are preferably formed from wires of large cross section. The process of the invention and the commutator produced thereby prove to be particularly suitable under these conditions.
  • a commutator in combination, a plurality of commutator segments each having at one end a tongue integral at one end thereof with the remainder of the segment and said tongue having opposite said end integral with said segment a free end; and a substantially U-shaped bracket having an intermediate portion extending beneath said tongue and held by the latter against the commutator segment so as to be fixed thereto, each bracket having a pair of legs extending from said intermediate portion thereof and directed away from the commutator axis so that armature leads may be located between said legs.
  • a commutator in combination, a plurality of commutator segments each having at one end a tongue integral at one end thereof with the remainder of the segment and said tongue having opposite said end integral with said segment a free end; and a substantially U-shaped bracket having an intermediate portion extending beneath said tongue and held by the latter against the commutator segment so as to be fixed thereto, each bracket having a pair of legs extending from said intermediate portion thereof and directed away from the commutator axis so that armature leads may be located between said legs, each segment being formed with a pair of elongated grooves between which said tongue thereof is located and said bracket having a pair of extensions respectively located in said grooves.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Motor Or Generator Current Collectors (AREA)
US172502A 1961-04-28 1962-02-12 Commutator for an electric motor Expired - Lifetime US3223869A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB62313A DE1134151B (de) 1961-04-28 1961-04-28 Verfahren zum Herstellen von Stromwendern fuer elektrische Maschinen

Publications (1)

Publication Number Publication Date
US3223869A true US3223869A (en) 1965-12-14

Family

ID=6973526

Family Applications (1)

Application Number Title Priority Date Filing Date
US172502A Expired - Lifetime US3223869A (en) 1961-04-28 1962-02-12 Commutator for an electric motor

Country Status (4)

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US (1) US3223869A (de)
CH (1) CH391870A (de)
DE (1) DE1134151B (de)
GB (1) GB944536A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3394454A (en) * 1962-03-26 1968-07-30 Western Electric Co Methods of making insulationpenetrating clip-type electrical connectors
US3486056A (en) * 1967-03-09 1969-12-23 Eastman Kodak Co Commutator
US3492519A (en) * 1967-09-11 1970-01-27 Kirkwood Commutator Corp Commutator and commutator blank for dynamoelectric machines and method of making same
US4326140A (en) * 1977-10-03 1982-04-20 Siemens Aktiengesellschaft Electric motor having a hook-shaped commutator
US4342933A (en) * 1976-01-20 1982-08-03 Kautt & Bux Kg Electrical commutator
US5189329A (en) * 1988-09-26 1993-02-23 Johnson Electric S.A. Assembled commutator
US5604391A (en) * 1992-03-26 1997-02-18 Watliff Company Limited Armature
US20020121834A1 (en) * 2001-03-01 2002-09-05 Kenji Furuya Rotor for small motors and manufacturing method therefor

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1292736B (de) * 1965-09-23 1969-04-17 Bosch Gmbh Robert Verfahren zur Herstellung der Anschlussfahnen eines Rollkommutators fuer elektrischeMaschinen und Rollkommutator mit nach dem Verfahren hergestellten Anschlussfahnen
GB2223888B (en) * 1988-09-26 1992-09-23 Johnson Electric Ind Mfg Commutator
GB9208980D0 (en) * 1992-04-25 1992-06-10 Johnson Electric Sa An assembled commutator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US969892A (en) * 1908-12-21 1910-09-13 Allis Chalmers Commutator bar and lead.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2826707A (en) * 1955-04-12 1958-03-11 Hoover Co Commutators for dynamo-electric machines
DE1072310B (de) * 1956-09-08

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US969892A (en) * 1908-12-21 1910-09-13 Allis Chalmers Commutator bar and lead.

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3394454A (en) * 1962-03-26 1968-07-30 Western Electric Co Methods of making insulationpenetrating clip-type electrical connectors
US3486056A (en) * 1967-03-09 1969-12-23 Eastman Kodak Co Commutator
US3492519A (en) * 1967-09-11 1970-01-27 Kirkwood Commutator Corp Commutator and commutator blank for dynamoelectric machines and method of making same
US4342933A (en) * 1976-01-20 1982-08-03 Kautt & Bux Kg Electrical commutator
US4326140A (en) * 1977-10-03 1982-04-20 Siemens Aktiengesellschaft Electric motor having a hook-shaped commutator
US5189329A (en) * 1988-09-26 1993-02-23 Johnson Electric S.A. Assembled commutator
US5604391A (en) * 1992-03-26 1997-02-18 Watliff Company Limited Armature
US20020121834A1 (en) * 2001-03-01 2002-09-05 Kenji Furuya Rotor for small motors and manufacturing method therefor
US6731041B2 (en) * 2001-03-01 2004-05-04 Mabuchi Motor Co., Ltd. Rotor for small motors and manufacturing method therefor

Also Published As

Publication number Publication date
DE1134151B (de) 1962-08-02
GB944536A (en) 1963-12-18
CH391870A (de) 1965-05-15

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